Which of the following is a characteristic of a serial I/O port?()A、RJ-11 connectorB、DB-15 connectorC、DB-9 connectorD、RJ-45 connector

Which of the following is a characteristic of a serial I/O port?()

  • A、RJ-11 connector
  • B、DB-15 connector
  • C、DB-9 connector
  • D、RJ-45 connector

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